How to assemble the thread tension in Morse 6500 Apollo? Thanks

SOURCE: thread tension dial

Hi , the two washer are assemble the curve should be back each other , first put a piece of thin tosser like a small nail put spacer can struck the tosser ,put washer back to back cone retainer next spring next cover with number indicating tensioner of thread next the knob.Put the tread between two cuve for enough tension.

SOURCE: Brother PE-150V bobbin thread

For embroidery, and zig-zag, and because the needle makes side movements, it needs more needle thread.
So try to keep you needle thread not very tight,
and tight up your bobbin case tension more, so that the two threads meet under the meterial.

SOURCE: help!

Have a look at link it may helps
http://www.repairsewingmachine.com/

SOURCE: Tension problem Bottom thread is loopy and sloppy

SALUDOS, MI MAQUINA HACE ESACTAMENTE LO MISMO UN DIA DERREPENTE DEJO DE BORDAR Y TIRA TODO EL HILO, LO HACE BOLAS POR LA PARTE DE ABAJO, Y DESCUBRI QUE SE ROMPIO UNA LAMINITA QUE LLEVA FRENTE A LA LANZADERA DONDE SE COLOCA LA BOBINA.
TAL LAMINITA SE LLAMA RESORTE PERO NO TIENE NUMERO NO LA HE PODIDO ENCONTRAR, DICHO RESORTE VA INSTALADO AL LADO DERECHO EN EL MISMO LUGAR DONDE ESTA INSTALADO EL LASER. AGRADECERIA ME DIERAN EL NUMERO PARA PODERLA COMPRAR. MIL GRACIAS.

SOURCE: Singer Featherweight tension assembly

Putting this back together is a thirty second job if you have done it a hundred times. If you have never done it but have mechanical aptitude, it may be a challenge.

Whatever you do, don't bend the check spring out of shape!

Below is a link to the Singer site with the schematic for reassembly. When placing the check spring back in place, place it in about the 6 o'clock position with no tension so that it has a fair amount of check before pulling it up in place..

When setting the tension, at a setting of "1" the tension disks should just be slightly compressing the beehive spring. "0" is almost no tension at all. Normal sewing is 5.

Get all of the parts together and push in the cup with the numbers while screwing on the knurled nut taking care to get the pin in one of the holes.

http://www.parts.singerco.com/CPpartCharts/2_2999/221-1_221K1_221K4_221K5.pdf